CN111562419A - Current sensor system - Google Patents
Current sensor system Download PDFInfo
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- CN111562419A CN111562419A CN202010489896.XA CN202010489896A CN111562419A CN 111562419 A CN111562419 A CN 111562419A CN 202010489896 A CN202010489896 A CN 202010489896A CN 111562419 A CN111562419 A CN 111562419A
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- current
- carrying conductor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/205—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using magneto-resistance devices, e.g. field plates
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The present invention provides a current sensor system, comprising: a first current sensor comprising a first current carrying conductor and a first magnetic sensor, the first magnetic sensor positioned about the first current carrying conductor; a second current sensor comprising a second current carrying conductor and a second magnetic sensor, the second magnetic sensor positioned about the second current carrying conductor; one end of the first current-carrying conductor is electrically connected with one end of the second current-carrying conductor, and the current to be measured sequentially flows through the first current-carrying conductor and the second current-carrying conductor. Compared with the prior art, in the current sensor system, the output or sensitivity of the first current sensor is increased or decreased by the external magnetic field in the non-sensitive axis direction, and the output or sensitivity of the second current sensor is decreased or increased by the external magnetic field in the non-sensitive axis direction, so that the external magnetic field inhibition can be improved, and the current detection precision is improved.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of current sensors, in particular to a current sensor system for improving external magnetic field suppression by using a double current sensor.
[ background of the invention ]
Current sensors for measuring the magnitude of current are widely used in various electronic devices. For the current sensor, the sensitivity of the magneto-resistance sensor in the current sensor can be changed by the existence of an external magnetic field in the direction of a non-sensitive axis, so that the detection precision of the current is reduced.
Therefore, it is necessary to provide a technical solution to overcome the above problems.
[ summary of the invention ]
An object of the present invention is to provide a current sensor system that can improve suppression of an external magnetic field, thereby improving detection accuracy of a current.
According to one aspect of the present invention, there is provided a current sensor system comprising: a first current sensor comprising a first current carrying conductor and a first magnetic sensor, the first magnetic sensor positioned about the first current carrying conductor; a second current sensor comprising a second current carrying conductor and a second magnetic sensor, the second magnetic sensor positioned about the second current carrying conductor; one end of the first current-carrying conductor is electrically connected with one end of the second current-carrying conductor, and the current to be measured sequentially flows through the first current-carrying conductor and the second current-carrying conductor.
Further, the external magnetic field in the non-sensitive axis direction increases or decreases the output of the first current sensor, and the external magnetic field in the non-sensitive axis direction decreases or increases the output of the second current sensor.
Further, the direction of the magnetic resistance magnetic moment in the second current sensor is opposite to the direction of the magnetic resistance magnetic moment in the first current sensor.
Further, the first current sensor and the second current sensor are in central symmetry.
The first current-carrying conductor further comprises a first leg part, a second leg part and a first connecting part, the first leg part and the second leg part are positioned on the same side of the first connecting part, one end of the first leg part is used as the other end of the first current-carrying conductor, and the other end of the first leg part is connected with one end of the first connecting part; one end of the second leg portion is used as one end of the first current-carrying conductor, and the other end of the second leg portion is connected with the other end of the first connecting portion; the second current-carrying conductor comprises a third leg part, a fourth leg part and a second connecting part, the third leg part and the fourth leg part are positioned on the same side of the second connecting part, one end of the third leg part is used as one end of the second current-carrying conductor, and the other end of the third leg part is connected with one end of the second connecting part; one end of the fourth leg portion serves as the other end of the second current-carrying conductor, and the other end of the fourth leg portion is connected with the other end of the second connecting portion.
Further, the first magnetic sensor includes a first magnetic sensor cell and a second magnetic sensor cell, the first and second magnetic sensor cells being positioned around the first current carrying conductor to form a differential output; the second magnetic sensor includes third and fourth magnetic sensor cells positioned about the second current carrying conductor to form a differential output.
Further, the first magnetic sensor and the second magnetic sensor are both magneto-resistance sensors, the first magnetic sensor unit and the second magnetic sensor unit are respectively located above the first leg and the second leg, and the third magnetic sensor unit and the fourth magnetic sensor unit are respectively located above the third leg and the fourth leg; or the first and second magnetic sensor units are respectively located below the first and second legs, and the third and fourth magnetic sensor units are respectively located below the third and fourth legs.
Further, an average value of the outputs of the first current sensor and the second current sensor is taken as the output of the current sensor system.
Further, the current sensor system further comprises a current connection conductor, and one end of the first current-carrying conductor is electrically connected with one end of the second current-carrying conductor through the current connection conductor.
Further, the current sensor system further comprises a current input conductor and a current output conductor, the current input conductor being electrically connected to the other end of the first current carrying conductor; the current output conductor is electrically connected to the other end of the second current carrying conductor.
Compared with the prior art, the current sensor system comprises the first current sensor and the second current sensor, wherein the output or sensitivity of the first current sensor is increased or decreased by the external magnetic field in the non-sensitive axis direction, and the output or sensitivity of the second current sensor is decreased or increased by the external magnetic field in the non-sensitive axis direction, so that the average value of the output or sensitivity of the first current sensor and the second current sensor is hardly influenced by the external magnetic field, the external magnetic field suppression is improved, and the current detection precision is improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
FIG. 1 is a schematic diagram of a current sensor system in accordance with an embodiment of the present invention;
FIG. 2 shows the effective anisotropy field HkIn the case of 200G, the single current sensor and the current sensor system of the present invention shown in fig. 1 normalize the sensitivity versus the magnetic field in the x-direction of the insensitive axis.
[ detailed description ] embodiments
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Unless otherwise specified, the terms connected, and connected as used herein mean electrically connected, directly or indirectly.
Fig. 1 is a schematic structural diagram 100 of a current sensor system according to an embodiment of the invention. The current sensor system 100 shown in fig. 1 includes a first current sensor 1, a second current sensor 2, a current input conductor 3, a current output conductor 4, and a current connection conductor 5.
The first current sensor 1 comprises a first current carrying conductor 102 and a first magnetic sensor 101, the first current carrying conductor 102 is used for providing a passage for a measured current I to flow through, and the first magnetic sensor 101 is positioned around the first current carrying conductor 102.
The second current sensor 2 comprises a second current carrying conductor 202 and a second magnetic sensor 201, the second current carrying conductor 202 is used for providing a passage for a measured current I to flow through, and the second magnetic sensor 201 is positioned around the second current carrying conductor 202.
One end of the first current-carrying conductor 102 is opposite to one end of the second current-carrying conductor 202 and is electrically connected with the current connecting conductor 5, and the other end of the first current-carrying conductor 102 is opposite to the other end of the second current-carrying conductor 202 and is arranged at an interval; the current input conductor 3 and the current output conductor 4 are arranged opposite to each other at an interval, the current input conductor 3 is electrically connected to the other end of the first current-carrying conductor 102, and the current output conductor 4 is electrically connected to the other end of the second current-carrying conductor 202. The current I to be measured flows in from the current input conductor 3, flows through the first current carrying conductor 102, the current connecting conductor 5, and the second current carrying conductor 202 in this order, and flows out from the current output conductor 4.
In the particular embodiment shown in fig. 1, the current input conductor 3 and the current output conductor 4 are located outside the first current carrying conductor 102 and the second current carrying conductor 202, and the longitudinal extension direction of the current input conductor 3 and the current output conductor 4 is perpendicular to the longitudinal extension direction of said first current carrying conductor 102 and said second current carrying conductor 202.
In the embodiment shown in fig. 1, the first current sensor 1 and the second current sensor 2 have the same structure.
In the first current sensor 1, the first current-carrying conductor 102 is a U-shaped conductor, and includes a first leg portion 102a, a second leg portion 102b, and a first connection portion 102c located between the first leg portion 102a and the second leg portion 102b, the first leg portion 102a and the second leg portion 102b are located on the same side of the first connection portion 102c, one end of the first leg portion 102a serves as the other end of the first current-carrying conductor 102, and the other end of the first leg portion 102a is connected to one end of the first connection portion 102 c; one end of the second leg portion 102b serves as one end of the first current carrying conductor 102, and the other end of the second leg portion 102b is connected to the other end of the first connection portion 102 c. The first magnetic sensor 101 is a magnetoresistive sensor, and includes a first magnetoresistive sensor cell 101a and a second magnetoresistive sensor cell 101b, and the first magnetoresistive sensor cell 101a and the second magnetoresistive sensor cell 101b are respectively located above the first leg portion 102a and the second leg portion 102b to form differential output.
In the second current sensor 2, the second current-carrying conductor 202 is a U-shaped conductor, and includes a third leg portion 202a, a fourth leg portion 202b, and a second connection portion 202c located between the third leg portion 202a and the fourth leg portion 202b, the third leg portion 202a and the fourth leg portion 202b are located on the same side of the second connection portion 202c, one end of the third leg portion 202a serves as one end of the second current-carrying conductor 202, and the other end of the third leg portion 202a is connected to one end of the second connection portion 202 c; one end of the fourth leg portion 202b serves as the other end of the second current-carrying conductor 202, and the other end of the fourth leg portion 202b is connected to the other end of the second connection portion 202 c. The second magnetic sensor 201 is a magnetoresistive sensor, and includes a third magnetoresistive sensor cell 201a and a fourth magnetoresistive sensor cell 201b, and the third magnetoresistive sensor cell 201a and the fourth magnetoresistive sensor cell 201b are respectively located above the third leg 202a and the fourth leg 202b to form differential output.
It should be particularly noted that in another embodiment, the first magnetoresistive sensor cell 101a and the second magnetoresistive sensor cell 101b may be respectively located below the first leg portion 102a and the second leg portion 102b to form a differential output; the third magnetoresistive sensor cell 201a and the fourth magnetoresistive sensor cell 201b are located below the third leg 202a and the fourth leg 202b, respectively, to form a differential output.
In the embodiment shown in fig. 1, the first current sensor 1 and the second current sensor 2 are centrosymmetric.
The central symmetry is defined as: if one figure is rotated 180 degrees around a certain point and can be superposed with the other figure, the two figures are in central symmetry. Therefore, the first current sensor 1 and the second current sensor 2 are centrosymmetric and can be expressed as follows: the second current sensor 2 can be overlapped with the first current sensor 1 after rotating 180 degrees around a certain point. Specifically, the "first current sensor 1 and the second current sensor 2 are centrosymmetric" includes: the first current carrying conductor 102 is centrosymmetric to the second current carrying conductor 202; the first magnetic sensor 101 is centrosymmetric to the second magnetic sensor 201.
After the second current sensor 2 rotates 180 degrees around a certain point, the second current sensor can be overlapped with the first current sensor 1, so that the direction of the magnetic resistance magnetic moment M in the second current sensor 2 is opposite to the direction of the magnetic resistance magnetic moment M in the first current sensor 1.
For convenience of description, an xy coordinate system is defined in fig. 1. Here, an axis (non-sensitive axis) parallel to the direction of the magnetic moment M is defined as an x-axis, and an axis (sensitive axis) perpendicular to the direction of the magnetic moment M is defined as a y-axis. The external magnetic field is H in the sensitive axis directionyIn the direction of the non-sensitive axis Hx。
A measured current I, a magnetic field H generated at the first magnetoresistive sensor cell 101a11Generating a magnetic field-H at the second magnetoresistive sensor cell 101b12(ii) a The output of the first magnetoresistive sensor cell 101a is V11＝[MR/(Hk+Hx)][(H11/I)I+Hy]Where MR is the magnetoresistance ratio, HkIs the effective anisotropy field; the output of the second magnetoresistive sensor cell 101b is V12＝[MR/(Hk+Hx)][-(H12/I)I+Hy](ii) a The output of the first current sensor 1 is V1＝V11-V12＝[MR/(Hk+Hx)][(H11+H12)/I]I＝[MR/(Hk+Hx)]GI, where G is the coupling constant from current to magnetic field. From this output equation of the first current sensor 1, it can be seen that the external magnetic field H in the non-sensitive axis directionxSo that the output or sensitivity of the first current sensor 1 is increased or decreased.
A current I to be measured, a magnetic field H generated at the magnetoresistive sensor cell 201a21Generating a magnetic field-H at the magnetoresistive sensor cell 201b22(ii) a The output of the magnetoresistive sensor cell 201a is V21＝[MR/(Hk-Hx)][(H21/I)I-Hy](ii) a The output of the magnetoresistive sensor cell 201b is V22＝[MR/(Hk-Hx)][-(H22/I)I-Hy](ii) a The output of the second current sensor 2 is V2＝V21-V22＝[MR/(Hk-Hx)][(H21+H22)/I]I＝[MR/(Hk-Hx)]GI. From this output equation of the second current sensor 2, it can be seen that the external magnetic field H in the direction of the non-sensitive axisxSo that the output or sensitivity of the second current sensor 2 is reduced or increased.
The average value of the outputs of the first current sensor 1 and the second current sensor 2 is taken as the output of the current sensor system. The average value of the outputs of the first current sensor 1 and the second current sensor 2 is V ═ V (V ═ V)1+V2)/2＝(MR/Hk){1/[1-(Hx/Hk)2]GI due to Hx<<HkIt can be seen that the average values of the outputs of the first current sensor 1 and the second current sensor 2 are hardly affected by the external magnetic field, and thus the average value of the sensitivity is also hardly affected by the external magnetic field.
Please refer to fig. 2, which shows the effective anisotropy field HkIn the case of 200G, the single current sensor and the current sensor system of the present invention shown in fig. 1 normalize the sensitivity versus the magnetic field in the x-direction of the insensitive axis. It can be seen that, under the external magnetic field condition of +/-10G, the sensitivity error of the single current sensor is up to 5%, and the current transmission shown in figure 1 of the inventionThe sensitivity error of the sensor system is less than 0.3%. The sensitivity of the current sensor system in the invention is hardly influenced by an external magnetic field, and the detection precision of the current is improved.
In another embodiment, the first current sensor 1 and the second current sensor 2 may also be non-centrosymmetric, as long as the relative position relationship between the first current sensor 1 and the second current sensor 2 can be implemented: external magnetic field H in non-sensitive axial directionxSo that the output or sensitivity of the first current sensor 1 is increased or decreased; external magnetic field H in non-sensitive axial directionxSuch that the output or sensitivity of the second current sensor 2 is reduced or increased; the average value of the outputs of the first current sensor 1 and the second current sensor 2 is hardly affected by an external magnetic field, and thus the average value of the sensitivity is also hardly affected by the external magnetic field.
In summary, the current sensor system 100 of the present invention comprises a first current sensor 1 and a second current sensor 2, wherein the external magnetic field H in the non-sensitive axis directionxThe output or sensitivity of the first current sensor 1 is increased or decreased, and the output or sensitivity of the second current sensor 2 is decreased or increased by the external magnetic field in the non-sensitive axis direction, and therefore, the average value of the outputs or sensitivities of the first current sensor 1 and the second current sensor 2 is hardly affected by the external magnetic field.
The "U-shaped" herein refers to a shape similar to U in a broad sense, and does not need to be strictly consistent with the shape of the letter U, and certain modifications can be made.
In the present invention, the terms "connected", "connecting", and the like mean electrical connections, and direct or indirect electrical connections unless otherwise specified.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.
Claims (10)
1. A current sensor system, comprising:
a first current sensor comprising a first current carrying conductor and a first magnetic sensor, the first magnetic sensor positioned about the first current carrying conductor;
a second current sensor comprising a second current carrying conductor and a second magnetic sensor, the second magnetic sensor positioned about the second current carrying conductor;
one end of the first current-carrying conductor is electrically connected with one end of the second current-carrying conductor, and the current to be measured sequentially flows through the first current-carrying conductor and the second current-carrying conductor.
2. The current sensor system of claim 1,
the external magnetic field in the direction of the non-sensitive axis increases or decreases the output of the first current sensor, and the external magnetic field in the direction of the non-sensitive axis decreases or increases the output of the second current sensor.
3. The current sensor system of claim 2,
the direction of the magnetoresistive magnetic moment in the second current sensor is opposite to the direction of the magnetoresistive magnetic moment in the first current sensor.
4. The current sensor system of claim 3,
the first current sensor and the second current sensor are in central symmetry.
5. The current sensor system of claim 1,
the first current-carrying conductor comprises a first leg part, a second leg part and a first connecting part, the first leg part and the second leg part are positioned on the same side of the first connecting part, one end of the first leg part is used as the other end of the first current-carrying conductor, and the other end of the first leg part is connected with one end of the first connecting part; one end of the second leg portion is used as one end of the first current-carrying conductor, and the other end of the second leg portion is connected with the other end of the first connecting portion;
the second current-carrying conductor comprises a third leg part, a fourth leg part and a second connecting part, the third leg part and the fourth leg part are positioned on the same side of the second connecting part, one end of the third leg part is used as one end of the second current-carrying conductor, and the other end of the third leg part is connected with one end of the second connecting part; one end of the fourth leg portion serves as the other end of the second current-carrying conductor, and the other end of the fourth leg portion is connected with the other end of the second connecting portion.
6. The current sensor system of claim 5,
the first magnetic sensor includes first and second magnetic sensor cells positioned around the first current carrying conductor to form a differential output;
the second magnetic sensor includes third and fourth magnetic sensor cells positioned about the second current carrying conductor to form a differential output.
7. The current sensor system of claim 6,
the first magnetic sensor and the second magnetic sensor are both magnetoresistive sensors,
the first and second magnetic sensor units are respectively positioned above the first and second legs, and the third and fourth magnetic sensor units are respectively positioned above the third and fourth legs; or
The first and second magnetic sensor units are located below the first and second legs, respectively, and the third and fourth magnetic sensor units are located below the third and fourth legs, respectively.
8. The current sensor system of claim 1,
the average of the outputs of the first and second current sensors is taken as the output of the current sensor system.
9. The current sensor system of claim 1, further comprising a current connection conductor,
one end of the first current carrying conductor is electrically connected to one end of the second current carrying conductor via the current connection conductor.
10. The current sensor system of claim 1, further comprising a current input conductor and a current output conductor,
the current input conductor is electrically connected with the other end of the first current-carrying conductor;
the current output conductor is electrically connected to the other end of the second current carrying conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010489896.XA CN111562419A (en) | 2020-06-02 | 2020-06-02 | Current sensor system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010489896.XA CN111562419A (en) | 2020-06-02 | 2020-06-02 | Current sensor system |
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| Publication Number | Publication Date |
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| CN111562419A true CN111562419A (en) | 2020-08-21 |
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| CN202010489896.XA Pending CN111562419A (en) | 2020-06-02 | 2020-06-02 | Current sensor system |
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- 2020-06-02 CN CN202010489896.XA patent/CN111562419A/en active Pending
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